Porpidia Circumnigrata
''Porpidia'' is a genus of crustose lichens in the family Lecideaceae. ''Porpidia'' species primarily inhabit siliceous rocks, pebbles, and stonework, with rare occurrences on bark, wood, and compacted soil. The thallus, or body of the lichen, varies in appearance from thick and crusty to barely visible. It may form a continuous layer or develop cracks resulting in a segmented, structure. The colour of the thallus ranges from grey and white to orange. Taxonomy ''Porpidia'' was circumscription (taxonomy), circumscribed by the German lichenologist Gustav Wilhelm Körber in 1855, with ''Porpidia trullisata'' designated as the type species. Description Genus ''Porpidia'' consists of crustose lichens, meaning the thallus (the main body of the lichen) is closely attached to the surface it grows on. The thallus can vary in appearance, from thick and scaly to almost invisible, and may be solid or cracked into small pieces called . Its colour typically ranges from grey to white, thoug ...
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